TH05's undecompilable bullet spawn code needs them, adding yet another
dumb file that we'll always have to drag along…
Part of P0152, funded by -Tom- and [Anonymous].
motion_t is also used for certain animations in MAINE.EXE, so not all
instances refer to entities in playfield space. Explicitly specifying
the latter now allows us to gain…
Part of P0149, funded by Blue Bolt, Ember2528, and -Tom-.
nmlgc